void setup() {
  // put your setup code here, to run once:
pinMode(A0,INPUT);
pinMode(A1,INPUT);
digitalWrite(A0,1);
digitalWrite(A1,1);
lcd.begin(16, 2);
lcd.setCursor(0, 0);
lcd.print(" Arduino");
lcd.setCursor(0, 1);
lcd.print(" StopWatch");
delay(2000);
lcd.clear();
lcd.print(" Tekan Tombol");
lcd.setCursor(0, 1);
lcd.print(" Start / Stop");
}

void loop() {
  // put your main code here, to run repeatedly:
if (digitalRead(A0)==0){if ((millis() - lastButton) > delayAntiBouncing){
if (i==0){
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Start Timer");
mulai = millis();
fPaus = 0;
}
else if (i==1){
lcd.setCursor(0, 0);
lcd.print("Stop Timer ");
dataPaus = dataStopWatch;
fPaus = 1;
}
i =!i;
}
lastButton = millis();
}
else if (digitalRead(A1)==0 && fPaus == 1){
dataStopWatch = 0;
dataPaus = 0;
lcd.clear();
lcd.print("Reset Stopwatch");
lcd.setCursor(0, 1);
lcd.print("0:0:0.0");
delay(2000);
lcd.clear();
lcd.print(" Tekan Tombol");
lcd.setCursor(0, 1);
lcd.print(" Start / Stop");
}
if (i==1){
selesai = millis();
float jam, menit, detik, miliDetik;
unsigned long over;
}// MATH time!!!
dataStopWatch = selesai - mulai;
dataStopWatch = dataPaus + dataStopWatch;
jam = int(dataStopWatch / 3600000);
over = dataStopWatch % 3600000;
menit = int(over / 60000);
over = over % 60000;
detik = int(over / 1000);
miliDetik = over % 1000;
lcd.setCursor(0, 1);
lcd.print(jam, 0);
lcd.print(":");
lcd.print(menit, 0);
lcd.print(":");
lcd.print(detik, 0);
lcd.print(".");
if (jam < 10){
lcd.print(miliDetik, 0);
lcd.print(" ");
}
}
}